/*
    * Licensed under the GPL License. You may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *   https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
    *
    * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
    * WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
    * PURPOSE.
   */
  package psiprobe.tools.logging.logback;
  
  import ch.qos.logback.core.OutputStreamAppender;
  import ch.qos.logback.core.encoder.Encoder;
  import ch.qos.logback.core.encoder.LayoutWrappingEncoder;
  
  import java.io.File;
  
  import psiprobe.tools.logging.AbstractLogDestination;
  
  /**
   * A wrapper for a Logback appender for a specific logger.
   */
  public class LogbackAppenderAccessor extends AbstractLogDestination {
  
    /** The logger accessor. */
    private LogbackLoggerAccessor loggerAccessor;
  
    /**
     * Gets the logger accessor.
     *
     * @return the logger accessor
     */
    public LogbackLoggerAccessor getLoggerAccessor() {
      return loggerAccessor;
    }
  
    /**
     * Sets the logger accessor.
     *
     * @param loggerAccessor the new logger accessor
     */
    public void setLoggerAccessor(LogbackLoggerAccessor loggerAccessor) {
      this.loggerAccessor = loggerAccessor;
    }
  
    @Override
    public boolean isContext() {
      return getLoggerAccessor().isContext();
    }
  
    @Override
    public boolean isRoot() {
      return getLoggerAccessor().isRoot();
    }
  
    @Override
    public String getName() {
      return getLoggerAccessor().getName();
    }
  
    /**
     * Returns the log type, to distinguish logback appenders from other types like log4j appenders or
     * jdk handlers.
     *
     * @return the log type
     */
    @Override
    public String getLogType() {
      return "logback";
    }
  
    /**
     * Returns the name of this appender.
     *
     * @return the name of this appender.
     */
    @Override
    public String getIndex() {
      return (String) getProperty(getTarget(), "name", null);
    }
  
    /**
     * Returns the file that this appender writes to by accessing the {@code file} bean property of
     * the appender.
     *
     * <p>
     * If no such property exists, we assume the appender to write to stdout or stderr so the output
     * will be contained in catalina.out.
     *
     * @return the file this appender writes to
     */
    @Override
    public File getFile() {
      String fileName = (String) getProperty(getTarget(), "file", null);
      return fileName != null ? new File(fileName) : getStdoutFile();
    }
  
    @Override
   public String getEncoding() {
     if (getTarget() instanceof OutputStreamAppender) {
       OutputStreamAppender<?> appender = (OutputStreamAppender<?>) getTarget();
       Encoder<?> encoder = appender.getEncoder();
       if (encoder instanceof LayoutWrappingEncoder) {
         LayoutWrappingEncoder<?> base = (LayoutWrappingEncoder<?>) encoder;
         if (base.getCharset() != null) {
           return base.getCharset().name();
         }
       }
     }
     return null;
   }
 
   /**
    * Gets the level of the associated logger.
    *
    * @return the logger's level
    */
   @Override
   public String getLevel() {
     return getLoggerAccessor().getLevel();
   }
 
   /**
    * Returns the valid log level names.
    *
    * <p>
    * Note that Logback has no FATAL level.
    *
    * @return the valid log level names
    */
   @Override
   public String[] getValidLevels() {
     return new String[] {"OFF", "ERROR", "WARN", "INFO", "DEBUG", "TRACE", "ALL"};
   }
 
 }